Printing cylinder and design sheet for use therewith



April 1935- 1.. T. A. ROBINSON 1,996,348 I PRINTING CYLINDER AND DESIGN SHEET FOR USE THEREW ITH Filed March 11, 195i 2 Sheets-Sheet 1 I V v z I 7/ z);

39 V 33 F .3 Z: 5 I v i d ,za Z1 6' v 7 4/815 f 45 g 5 fl .z 1 fig J5 7 Z? 4 4 49 if I INVENTOR 1.. 7.14. Roe/M904 April 2, 1935. L. T. A. ROBINSON I 3 PRINTING CYLINDER AND DESIGN SHEET FOR USE THEREWITH Filed March 11, 1951 2 Sheets-Sheet 2 II I INVENTOR L. Z'AROfi/A/O/V fiY ' A TTORNEY pa red STATES P T F Patented Apr. 2, 1935 a PRINTING CYLINDER AND DESIGN SHEET FOR USE. rnsanwirn Leslie Thomas Albert Robinson; London, England Application March 11, 1931-, Serial No. 521,839 Great Britain September 12, 1930.

This invention relates to longitudinally split printing cylinders and design sheets for 'use therewith and more particularly to printing cylindisplaceable therebetween. so as to force the said,

separating faces of the segmentsapart in order to cause the separating. faces on. the other side of the cylinder axisto approach each other and thus apply tension to a design sheet the ends of which extend inwardly. of and between the'latter separating faces of the cylinder segments. The aforesaid means are adapted to be slidably displaced in opposite directions between the relevant separating faces of the cylinder segments and the said means may be intheformof a channel shaped wedge or awedge having at least one arcuate surface to form a pivotal surface for a superimposed segment. If desired a. modified form of wedge may be used in the form of. aplane faced wedge adaptedto be displaced in an axial direction or in a directionparallel to the. axis of the cylinder into and out of operative position between the relevant'cylinder separatingfaces and in contact therewith. "During tensidnlngf'of the design sheet theends thereof are unyieldingly held by means of metallic strips towhich the said ends are secured the said strips during the tensioning action being engaged in recesses in the opposed relevant separating faces.

In order that the invention may be clearly understood and readily carried into effect reference is made to the accompanying drawings which showdiagrammatioally. and byway of. ex-

ample constructions of segmental printing cylinders in accordance withthe present invention.

Figure l is a cross section of a printing'cylinde in accordance with the present invention. 5 g

Figure 2 is a part sectional elevation the section being taken on the line 2-2 Figurel. Y V Figure 3 is a cross section of a modified form of printing cylinder also in accordance with the present invention.

Figure 4 drawn to an enlarged scaleis'a section showing gap or joint filling means; V

Figure 5 is a detail-view-hereinafter described.

' Referring to Figure 1, I- and 2- represent two segments of a printing cylinder. f Bindicates a designsheet overlying the peripheral surfaces of the cylinder segmentsl, 2. Between the separating faces 4, 5 of the cylinder segments and on '35 one side'of the cylinder axis means such as a channel shaped wedge B is. disposed: thesaid wedge being adapted to be-displaced in an axial direction or in adirectionparallel to theaxisof the cylinder so as to apply tensionto the design 'tively. The two; cylinder segments aremounted on a shaft S'WhiCh. may be formed with fivejsides- ,two H), H of which are at right angles to a'n interconnecting.third'side l2 which as shown may be parallel to the plane of separation ofq the cylinder segments. The remaining two sideswliipgo M of the shaft 9 form a V- shaped. portion extending the full length of the shaftand the apex l5 7 of the V shaped portion of the shaft forms a pivotal point about which one of the segments namely the segment 'I is'adapted to be rocked in order to apply tension to the design sheet 3. The channel shaped wedged which preferably forms a continuous member extending the full length of and between thecylinder'segments- I, 2 has a straight arcuate .inner surface l6 of suitable radius which co-operates with a correspondingly shaped surface I! on the superimposed cylinder segment L; The lower face I8 of thechannel shapedwedge is preferably fiat and the inner side face H! of the wedge 6 is approximately at right angles to the lower face l8- of the wedge. The outer face 20 ofthe wedge is perpendicular tothe lowerface H3 and the outer face 28 of the-arouate portion H is struck from the apex l5 of the V shaped shaft portion. ThewedgeG as shown 40 may be formed in one piece or itmay be formedv in two pieces and the lower face 18 of the chem nel shaped wedge is provided preferably with a rectangular projection-'2! which may extend the entire length of the wedge 85. If g desired how.-

'same curvature as the curved face 36.

tapped ends of the projections 2I and operable against fixed resistances not shown. The projection (or projections) 2I tapers in thickness from one end to the other of the cylinder as shown in Figure 2 and the curved inner face I6 extends the entire length of the wedge. The segment I is provided with a V, shaped recess 22 of a somewhat greater angle-than that included by the sides I3, I4 of the V shaped portion of the shaft 9 so as to allow of the segment I rocking on the pivotal point I5 of the v shaped portion of the shaft 9. To facilitate positioning and subsequent tensioning of the design sheet each end thereof is provided on its inner face with a thin strip 23, 24 or wedge like strip of metal which is riveted to therespective end of the sheet, or the sheet ends may be secured to the strips 23, 24 by flanging the holes in the sheet as by stamping up the holes and subsequently clinching or expanding the ends of the flanged holes on the rear faces of the strips 23, 24. The strips 23, 24 may be of approximately rectangular form or the outer face of each strip 23, 24 may be bevelled or chamfered as'at 25, 2 6 and the two strips 23, 24 are disposed in recesses 21, 28 formed in the separating faces I, 8 of the cylinder segments. If convenient the inner faces of the strips23, 24 may be bevelled or chamfere'd in a somewhat similar manner as the outer faces. The bevelled faces assist the entry of the strips 23, 24 into the recesses 21, 28. Each strip as shown abuts against the bottom of its respective recess with a flat face 29 so that the plain flat side of the strip is secured direct to the end of a design sheet. Each of the recesses 21, 28 extend longitudinally the full length of the respective cylinder segment and the channel shaped wedge 6 maybe displaced in opposite directions by cap screws. The cap screws engage in the tapped holes in the projection or projections2I so that by slackening back one cap screw and screwing up the cap screw at the other end the wedge 6 can be displaced in one direction and by reversing the operation the wedge 6 can be displaced in the opposite direction thus tensioning or detensioning the design sheet 3.

In themodified form shown in Figure 3 the wedge in this arrangement is a plane faced wedge as shown at 3 In this arrangement the separating faces of the cylinder segments are cut in a particular manner. The cylinder segment 2 is formed with two arcuate faces 35, which are struck from the pivotal point I5. As in the arrangement shown in Figure l the separating faces I and 8 may abut when the segments are assembled, but the separating faces "on the opposite side of the cylinder are spaced apart as at 31, 38 and the outer corner of the cylinder segment I is curved as at 39 to the The ends of the design sheet 3 in this arrangement are suitably connected'to strips 23, 24 as by rivets or flanged holes in the design sheet ends but the recesses into which the strips 23, 24 are placed are formed in faces 40, 4! which are at an angle'to'the plane of the faces 1 and 8 the reason being so asto decrease the friction on the strips when closing the segments and to provide a better leading edge for the usual steel doctor to wipe over as well as to provide a better lead-in for the copper sheet. The design sheet ends may be connected to the strips 23, 24

in the manner shown, described and claimed in my co-pending application Serial No. 520,631,

filed March 6, 1931. The meeting plane of the faces 40, III are at such an angle that if the said plane be extended it will pass through the pivotal point I5.

The cylinder segments I, 2 when assembled in position may be retained in that position by rings 42, 43 Figure 2, having conical bores M, 45 which fit on to correspondingly cone shaped projections 46, 41 on the ends of the cylinder segments. These rings are secured in place by cap screws 48 which screw into the ends of the cylinder segments. By removing the cap screws from engagement with the rockable segment the latter can be rocked removed and/or replaced when desired and the said rings may form the fixed resistances to allow of the requisite displacement of the wedge by the use of cap screws passed through the said rings and into the tapped bores in the projection or projections on the rear face of the wedge 6 so that the latter can be displaced in either direction of two opposite directions. In order to remove the wedge in the arrangement shown in Figures 1 and 3 it is only necessary to remove the rings 22, 43 then place i a U shaped piece of metal of a suitable thickness over but not in contact with the wedge ends. Thereafter a cap screw is passed through the U shaped member into the tapped hole in the wedge end and by rotating the cap screw in the proper direction against the resistance offered by the U shaped member the wedge B can be removed. A reverse operation at the other end adjusts the wedge to its proper position between the segments. Either ring 42 or 23' at the thin end of the wedge may be bored to take a cap screw for pulling the wedge into position between the segments. In order to prevent entry of ink through the joint or gap 49 Figures 1, 3 and 4 the said gap or joint is closed by filling material 50. The latter may consist of asphalt, leather, balata, gutta percha, pitch, tar, bitumen, resin, horn, in powdered or solid form or any combination of such materials inserted either as a premoulded piece or inserted in a hot condition and then allowed to cool. Thereafter the outer surface SI of the insert 50 may be ironed under pressure either by hand or mechanically by a roller or heated roller and if desired subsequently burnished. Alternatively the filling material may be a piece of copper preformed to the requisite shape and having horns 52, 53 as shown in Figure 4, or if so desired the filling piece 58 may be copper type metal or other suitable metal injected or blown in under pressure when in a fluid or semi-fluid condition. The filling piece may be of such a nature that it can be superficially charred or hardened and/or burnished by the application of heat and pressure. The filling may be provided on its outer surface 5| with a coating or thin layer of metal by dipping, blowing the metal on, or by compacting a thin sheet of metal with the said surface by pressure or by electrolytical deposition of the metal thereon. Further as shown in Figure 5 the fillin piece may be enclosed wholly or partly in a casing 54 of metal such as sheet copper or other suitable metal. In such an arrangement however it is preferred that the filling material be of a plastic nature so that under pressure the material 59 will expand and form the horns 55, 56 and thus efiiciently close the gap or joint between the sheet ends.

,Assuming that the design sheet has been placed around the cylinder segments and that the respective strips have been engaged with the corresponding recesses in the separating faces of the cylinder segments and the filling der axis.

faces carrying the aforesaid strips on the other piece and the wedge placed in position then the wedge is forced inwardly and between the cylinder separating faces on one side of the cylin- This causes therecessed separating of the triangular or V shaped part of the. shaft to permit of such pivotal movement of the latter to effect the desired purpose.

What I claim is: 1. A longitudinally split printing cylinder comrising in combination a shaft having an acute angled fulcrum forming edge, a plurality of seg-,

ments mounted on the said shaft, one of such segments being mounted on and movable relative to said fulcrum-forming edge, a design sheet superimposed on and overlying the said segments, and means to effect tilting movement of the fulcrum-supported segment in order to tension the design sheet. g

2. A printing cylinder comprising in combination a shaft having an acute angled edge, a plurality of segments mounted on the said shaft, one of the segments being mounted on and movable relative to said acute angled edge, a tensionable design sheet superimposed on and overlying the cylinder segments, means'to retain the design.

sheet ends against outward displacementfrom between the segments, and means'between the said segments to rockone segment on the acute angled edge of the shaft so as to tension the design sheet. r

3. A printing cylinder comprising in combination a shaft, an acute angled edge on the said shaft, said cylinder being made up of segments together -mounted on the shaft, one segment rockable on the said acute angled edge of the shaft, a tensionable design sheet superimposed on and overlying the segments, means to restrain the design sheet ends against outward displacement from between the segments, and means adapted to rock the rockable segment on the acute anglededge of the shaft so asto tension the said design sheet.

4.. A printing cylinder comprising in combination a shaft, anacute angled edge thereon,.a segment rockably mounted thereon, a'further segment disposed below the rockable segment, a design sheet surrounding the said segments, means disposed on one side of the shaft and adapted to resist tensioning action applied to the design sheet, and means disposed between the cylinder segments and on the otherside of the shaft to force the said segments apart so as to apply tension to the design sheet.

5. A printing cylinder comprising in combination a shaft, an acute angled edge thereon, a segment rockably mounted thereon, a further segment disposed below the rockable segment, a tensionable design sheet surrounding the segments, means disposed onone side of theshaft and adapted to resist tensioning action appliedto the design sheet, and a wedge-shaped member disposed between the cylinder segments and on the other side of the shaft to force thesaid segments apartso' as to' apply tension tothewdesign sheet.

i 6. A printing cylinder comprising in combination a shaft, an acute angled edge thereon, a segment: rockably mounted thereon, a further segment disposed: below the rockable segment, atensionable design sheet surrounding the said'segments, bars rigidly securedflto the ends of the said design sheetand seated in recesses in the segments andadapted to act when soseatedas resistances against-tensioningaction applied to g the design sheet, and means to move the two segments relatively so as to apply tension to the design sheet.-

'7. A printing cylinder comprising in'combination a shaft having an acute angled edge thereon, a segment mounted on the said edge, a further segment disposed therebelow and rigidly M secured to the said shaft, a tensionable design 20 sheet surrounding the segments, bars disposed 011 oneside of the shaft and betweenthe'cylinder segments and engageable in recesses therein, and a wedge-shaped-member ,disposed between the cylinder, segments and onthe other side of the shaft andadapted by longitudinal displacement between the cylinder segments'to apply tension to the design sheet. I A

8. A -printing cylinder comprising in'combination, a shaft, a segment tiltably mounted, on a Vshaped edge on shaft, a second segment rigidly secured tothe shaft, a itensicnable design sheet surrounding the segment, meansdisposed between the segmentto resist tensioning of the saidsheet, and means to force the segments apart so to tilt the rockable segmentxo the a V-shaped edge of the shaft and tension to the design sheet '9. A printing cylinder comprising in combinations multi-sided shaft having a V-shaped edge formed by two contiguous sides, a segment rockthereby apply ably mounted on the V-shaped edge, a further segment disposed 'therebelow and mounted on a rectangularpart of the shaft, a tensionable de- 1 sign; sheet surrounding the segments,- means on. one side of I the shaft operative as resistances againsttensioning action imparted to the design sheet, and means operative to force the segments apart on one side of the shaftso as to tension the design sheet. Y

10. A printing cylinder comprising in combinationa-shaft, aV-shaped edge on the shaft, a

segment rockably mountedthereon, a further segment rigidly secured to the said shaft, resist- .ance means-on one sideof the shaft anddisposed between the segments, and means in abutting contact with the shaft and adapted when displacedlongitudinallyto move the rockable'segment so as totension the design sheet.

11. A- printing cylinder comprising in combination av shaft having a V-shaped edge, a cylinder made up of segments, one segment tiltable the shaft, resistancebars disposed on' one side of the ing an arcuate face adapted to cooperate with a shaft and engageable in recesses in -the.;sep arating faces of the segments, and a wedge havcorrespondingly curved'face on the rockable segdesign sheet; s 1 i 12. A printing cylinder comprising. in combinations. shaft,.a plurality of segments mounted thereon, a t'ensionable design sheet superimposed on and overlying the segments, resistance means connected with the design sheet ends on one side of the shaft disposed between the segments and engageable in recesses in the separating faces thereof, and a wedge having a bore disposed at eachend, the said bores being screw-threaded of opposite hands .to receive means to effect longitudinal displacement of the wedge so as to force the segments apart and consequently apply tension to the design sheet.

13. A printing cylinder comprising in combination a shaft, a V-shaped edge formed by contiguous sides of the said shaft, a segment mounted on the said V-shaped edge, a further segment disposed therebelow. and mounted on a rectangular portion of the shaft, a tensionable design sheet surrounding the segments, resistance means disposed between the segments on one side of the shaft and connected with the'design sheet ends, and a member tapering in thickness and displaceable longitudinally so as totilt the rockable segment on the V-shaped edge of the shaft and thereby apply tension to the design sheet.

14. A printing cylinder comprising in combination a shaft, a V-shaped edge formed by contiguous sides of the said shaft, a segment mounted on the said V-sha-ped edge, a further segment disposed therebelow and mounted on a rectangular portion of the shaft, a tensionable design sheet surrounding the segments, resistance means disposed between the segments' on one side of the shaft and connected with the design sheet ends, and a member movable in contact with the shaft and adapted when displaced longitudinally between the segments to force the latter apart at one side so as to tension the design sheet.

15. A printing cylinder comprising in combination a shaft, a V-shaped edge formed by contiguous sides of the said shaft, a segment mounted on the said V-shaped edge, a further segment disposed therebelow and mounted on a rectangular portion of the shaft, a tensionable design sheet surrounding the segments, resistance means disposed between the segments on one side of the shaft and connectedwith the design sheet ends, a member having two sides arranged at right angles to each other and two sides tapering longitudinally of the said member, and means to effect longitudinal displacement of the latter member while in butting contact with the shaft so as to cause the two longitudinally tapering sides of the said member to'effect tilting movement of one segment 50 as to tension the design sheet.

16. A printing cylinder comprising in combination a shaft, a V-shaped edge extending longitudinally of the said shaft, a rockable segment mounted thereon, the said segment having a plurality of separating faces, two of which faces embrace an obtuse angle, a further segment disposed below the rockable segment, a tensionable design sheet surrounding the said segments, means disposed on one side of the shaft and between the separating faces of the segments and adapted to restrain the design sheet ends against outward displacement, and means to cause relative tilting movement of the segments'to apply tension to the design sheet.

1'7. A longitudinally split printing cylinder comprising in combination a shaft, a plurality of segments mounted thereon, a design sheet superimposed on and overlying the said segments, means to effect relative tilting movement of the segments in order to tension the said design sheet, and means secured to the ends of the cylinder segments and embracing the shaft ends to retain the cylinder segments and design sheet in the assembled position.

18. A longitudinally split printing cylinder comprising in combination a shaft having a V- shaped edge extending longitudinally thereof, a

rockable segment mounted on the said V-shaped edge, a further segment disposed therebelow, a tensionable design sheet surrounding the segments, inclined opposed separating faces contiguously arranged on the two segments, the inclination of the said faces being in a plane which when extended passes through the pivotal point of the rockable segment, means disposed between the said inclined faces and connected to the design sheet ends to restrain the said ends against outward displacement from between the inclined separating faces, and means displaceable longitudinally of and between the cylinder segments to effect relative tilting of the segments in order to tension the design sheet.

19. A longitudinally split printing cylinder comprising in combination a shaft having five sides, two of which are disposed at right angles to an interconnecting third side, a -shaped edge formed by the other two sides and extending the full length of the cylinder shaft, a segment rockable on the said V-shaped edge, a further segment disposed therebelow, a tensionable design sheet surrounding the segment and having its ends extending inwardly of and between the separating faces of the segments on one side of the shaft, means to retain the design sheet ends in assembled position, and means to effect relative tilting movement of the segments to apply tension to the design sheet.

20. A longitudinally split printing cylinder comprising in combination a shaft having a V- shaped edge, a rockable segment mounted thereon, a further segment disposed therebelow, a tensionable design sheet surrounding the segments, the meeting faces on one side of the shaft presenting angularly related portions and areuate contacting portions, the arcuate contacting portions having their radii struck from the V- shaped edge on the shaft, 'means in the angularly arranged separating faces to retain the design sheet in assembled position, and means disposed betweenthese segments on the other side of the shaft and adapted by longitudinal displacement between the segments to apply tension to the design sheet.

21. A longitudinally split printing cylinder comprising two cylinder segments, a shaft having a V-shaped edge disposed between and supporting the said segments, one of the latter being rockable on the V-shaped edge of the shaft, a tensionable design sheet surrounding the segments and having its ends extending inwardly therebetween, resistance members disposed between the segments and connected with the design sheet ends, a wedge disposed between the segments on the other side of the shaft and having a curved surface adapted to cooperate with a correspondingly curved surface on the rockable segment, the curved surface on the latter extending into a surface of different curvature disposed adjacent to the peripheral surface of the tiltable segment and having its radius struck from the V-shaped edge on the shaft, and means to effect displacement of the wedge to tilt the rockable segment so as to tension the design sheet.

LESLIE THOMAS ALBERT ROBINSON. 

